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[media] cinergyT2-fe: don't do DMA on stack 

The USB control messages require DMA to work. We cannot pass
a stack-allocated buffer, as it is not warranted that the
stack would be into a DMA enabled area.

Reviewed-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-10-07 06:16:59 -03:00
parent c2730eef5f
commit 0d43c0ff8b
1 changed files with 33 additions and 23 deletions
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56
drivers/media/usb/dvb-usb/cinergyT2-fe.c
View File

@ -139,6 +139,10 @@ static uint16_t compute_tps(struct dtv_frontend_properties *op)
struct cinergyt2_fe_state {
struct dvb_frontend fe;
struct dvb_usb_device *d;
unsigned char data[64];
struct mutex data_mutex;
struct dvbt_get_status_msg status;
};
@ -146,28 +150,31 @@ static int cinergyt2_fe_read_status(struct dvb_frontend *fe,
enum fe_status *status)
{
struct cinergyt2_fe_state *state = fe->demodulator_priv;
struct dvbt_get_status_msg result;
u8 cmd[] = { CINERGYT2_EP1_GET_TUNER_STATUS };
int ret;
ret = dvb_usb_generic_rw(state->d, cmd, sizeof(cmd), (u8 *)&result,
sizeof(result), 0);
mutex_lock(&state->data_mutex);
state->data[0] = CINERGYT2_EP1_GET_TUNER_STATUS;
ret = dvb_usb_generic_rw(state->d, state->data, 1,
state->data, sizeof(state->status), 0);
if (!ret)
memcpy(&state->status, state->data, sizeof(state->status));
mutex_unlock(&state->data_mutex);
if (ret < 0)
return ret;
state->status = result;
*status = 0;
if (0xffff - le16_to_cpu(result.gain) > 30)
if (0xffff - le16_to_cpu(state->status.gain) > 30)
*status |= FE_HAS_SIGNAL;
if (result.lock_bits & (1 << 6))
if (state->status.lock_bits & (1 << 6))
*status |= FE_HAS_LOCK;
if (result.lock_bits & (1 << 5))
if (state->status.lock_bits & (1 << 5))
*status |= FE_HAS_SYNC;
if (result.lock_bits & (1 << 4))
if (state->status.lock_bits & (1 << 4))
*status |= FE_HAS_CARRIER;
if (result.lock_bits & (1 << 1))
if (state->status.lock_bits & (1 << 1))
*status |= FE_HAS_VITERBI;
if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
@ -232,34 +239,36 @@ static int cinergyt2_fe_set_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
struct cinergyt2_fe_state *state = fe->demodulator_priv;
struct dvbt_set_parameters_msg param;
char result[2];
struct dvbt_set_parameters_msg *param;
int err;
param.cmd = CINERGYT2_EP1_SET_TUNER_PARAMETERS;
param.tps = cpu_to_le16(compute_tps(fep));
param.freq = cpu_to_le32(fep->frequency / 1000);
param.flags = 0;
mutex_lock(&state->data_mutex);
param = (void *)state->data;
param->cmd = CINERGYT2_EP1_SET_TUNER_PARAMETERS;
param->tps = cpu_to_le16(compute_tps(fep));
param->freq = cpu_to_le32(fep->frequency / 1000);
param->flags = 0;
switch (fep->bandwidth_hz) {
default:
case 8000000:
param.bandwidth = 8;
param->bandwidth = 8;
break;
case 7000000:
param.bandwidth = 7;
param->bandwidth = 7;
break;
case 6000000:
param.bandwidth = 6;
param->bandwidth = 6;
break;
}
err = dvb_usb_generic_rw(state->d,
(char *)&param, sizeof(param),
result, sizeof(result), 0);
err = dvb_usb_generic_rw(state->d, state->data, sizeof(*param),
state->data, 2, 0);
if (err < 0)
err("cinergyt2_fe_set_frontend() Failed! err=%d\n", err);
mutex_unlock(&state->data_mutex);
return (err < 0) ? err : 0;
}
@ -281,6 +290,7 @@ struct dvb_frontend *cinergyt2_fe_attach(struct dvb_usb_device *d)
s->d = d;
memcpy(&s->fe.ops, &cinergyt2_fe_ops, sizeof(struct dvb_frontend_ops));
s->fe.demodulator_priv = s;
mutex_init(&s->data_mutex);
return &s->fe;
}